<?php

/**
 * Zend Framework
 *
 * LICENSE
 *
 * This source file is subject to the new BSD license that is bundled
 * with this package in the file LICENSE.txt.
 * It is also available through the world-wide-web at this URL:
 * http://framework.zend.com/license/new-bsd
 * If you did not receive a copy of the license and are unable to
 * obtain it through the world-wide-web, please send an email
 * to license@zend.com so we can send you a copy immediately.
 *
 * @category   Zend
 * @package    Zend_Validate
 * @copyright  Copyright (c) 2005-2009 Zend Technologies USA Inc. (http://www.zend.com)
 * @license    http://framework.zend.com/license/new-bsd     New BSD License
 * @version    $Id: Digits.php 16933 2009-07-21 20:24:35Z matthew $
 */


/**
 * @see Zend_Validate_Abstract
 */
require_once 'Zend/Validate/Abstract.php';


/**
 * @category   Zend
 * @package    Zend_Validate
 * @copyright  Copyright (c) 2005-2009 Zend Technologies USA Inc. (http://www.zend.com)
 * @license    http://framework.zend.com/license/new-bsd     New BSD License
 */
class Zend_Validate_Digits extends Zend_Validate_Abstract
{
	const NOT_DIGITS   = 'notDigits';
	const STRING_EMPTY = 'stringEmpty';
	const INVALID      = 'digitsInvalid';

	/**
	 * Digits filter used for validation
	 *
	 * @var Zend_Filter_Digits
	 */
	protected static $_filter = null;

	/**
	 * Validation failure message template definitions
	 *
	 * @var array
	 */
	protected $_messageTemplates = array(
	self::NOT_DIGITS   => "'%value%' contains not only digit characters",
	self::STRING_EMPTY => "'%value%' is an empty string",
	self::INVALID      => "Invalid type given, value should be string, integer or float",
	);

	/**
	 * Defined by Zend_Validate_Interface
	 *
	 * Returns true if and only if $value only contains digit characters
	 *
	 * @param  string $value
	 * @return boolean
	 */
	public function isValid($value)
	{
		if (!is_string($value) && !is_int($value) && !is_float($value)) {
			$this->_error(self::INVALID);
			return false;
		}

		$this->_setValue((string) $value);

		if ('' === $this->_value) {
			$this->_error(self::STRING_EMPTY);
			return false;
		}

		if (null === self::$_filter) {
			require_once 'Zend/Filter/Digits.php';
			self::$_filter = new Zend_Filter_Digits();
		}

		if ($this->_value !== self::$_filter->filter($this->_value)) {
			$this->_error(self::NOT_DIGITS);
			return false;
		}

		return true;
	}

}
